EP0046026B1 - Transfert, blindage et fixage des dessins de poudre - Google Patents

Transfert, blindage et fixage des dessins de poudre Download PDF

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Publication number
EP0046026B1
EP0046026B1 EP81303438A EP81303438A EP0046026B1 EP 0046026 B1 EP0046026 B1 EP 0046026B1 EP 81303438 A EP81303438 A EP 81303438A EP 81303438 A EP81303438 A EP 81303438A EP 0046026 B1 EP0046026 B1 EP 0046026B1
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EP
European Patent Office
Prior art keywords
image
toner
coating
receptor
transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81303438A
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German (de)
English (en)
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EP0046026A3 (en
EP0046026A2 (fr
Inventor
Melville R.V. Sahyun
Tsung-I Chen
Timothy W. King
Valdis Mikelsons
Smarajit Mitra
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3M Co
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Minnesota Mining and Manufacturing Co
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Publication of EP0046026A2 publication Critical patent/EP0046026A2/fr
Publication of EP0046026A3 publication Critical patent/EP0046026A3/en
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Publication of EP0046026B1 publication Critical patent/EP0046026B1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/0046—Organic components thereof being macromolecular obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/22—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
    • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
    • G03G7/002—Organic components thereof
    • G03G7/0026—Organic components thereof being macromolecular
    • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds

Definitions

  • This invention relates to development, transfer, encapsulation, and fixing of dried liquid toner electrographic images. In another aspect, it relates to electroradiography and a method of producing stable, abrasion-resistant images of high transmission optical densities.
  • Electrography refers to the processes of electrophotography, electroradiography, and magnetography.
  • the process of electrography has been described in numerous patents, such as those issued to Chester F. Carlson, including U.S. Patent Nos. 2,221,776, 2,297,691, and 2,357,809.
  • the process as taught in these and other patents, essentially comprises production of a latent electrostatic image using photoconductive media and the subsequent development and transfer of a visible image therefrom.
  • a latent electrostatic image may also be formed by spraying the charge onto a suitable charge-retaining surface as taught, for example, in U.S. Patent Nos. 2,143,214, 3,773,417, and 3,017,560.
  • the latent image is magnetic and may be developed with appropriately magnetized or magnetizable developer particles, as described in U.S. Patent No. 3,520,811.
  • a liquid developer comprises a dispersion of the developer particles in a suitable liquid dispersant.
  • Transfer of the developed image to another surface is often accomplished by means of externally applied electrostatic forces, by adhesion of the image particles to a "tacky" receptor sheet using contact and pressure, or by utilization of a resin-coated receptor sheet having a desirable transfer surface. Fixing of the transferred image is frequently accomplished by pressure, heating, and subsequently cooling to room temperature.
  • transfer and fixation may be accomplished by absorption and/or electrostatic transfer, as disclosed in U.S. Patent Nos. 3,419,411, 3,247,007, and 2,899,335.
  • dispersant is still present upon transfer, the images may suffer from the problem of lateral displacement. Such a problem prevents good resolution of the image. If it is desirable to remove the dispersant, the additional problems of evaporation, heat, and safe removal of vapors are present.
  • Patent Office Defensive Publication T879,009 discloses a receiving sheet with a softened surface which is pressed against an organic photoconductor bearing a liquid developed xerographic image which image retains a portion of the liquid developing solvent therein. The image transfers to the receiver during the application of heat and pressure. About 10 to 95% of the liquid developer solvent is removed, with at least 5% residual solvent required for transfer.
  • the receiver sheets are coated with solvent-susceptible resins, which apparently "swell” in the presence of the liquid dispersant and allow the toner particles to become imbedded in the resin coating.
  • the resin coating weight is 0.2 g/ft 2 (about 1.5 11m thick) compared to the preferred thicker coatings (about 3 to 100 pm) in the present invention.
  • the highest D-max for the transferred image that is listed in the publication is 1.2.
  • U.S. Patent No. 2,930,711 discloses an electrostatic printing method in which liquid developer is used.
  • the dispersant is "blotted” away before transfer of the image, during which process as much as 20% of the toner particles are transferred to the blotting material.
  • the liquid-free powder image is then transferred to a paper coated or impregnated with a thermosoftening material by heat and pressure, or the dry visual image is brought into contact with an adhesive covered transfer media.
  • both of these methods of transfer depend upon "tackiness" of the receptor coating in order to achieve transfer of the toner particles.
  • Adhesive transfer techniques may result in images having problems of durability. Such images are subject to rubbing-off.
  • receptor coatings of the present invention are not necessarily "tacky" but achieve transfer of toner particles due to the critical rheological properties of the receptor coatings. Also, whereas the two above-mentioned publications disclose considerable loss in toner particles (if dry transfer takes place), the present invention transfers at least 90%, and preferably at least 97%, of dried toner particles to achieve images with superior optical densities.
  • U.S. Patent No. 2,855,324 discloses thermoplastic coated receptors to which a dry toner image may be transferred by contact under pressure. As mentioned above, this type of transfer may result in problems of durability.
  • U.S. Patent No. 3,640,749 discloses coating a transferred dry powder image and receptor with a dispersion of a synthetic resin in water.
  • U.S. Patent No. 4,071,362 discloses use of a receptive styrene-type resin on a thermally resistant base film to fuse with thermoplastic coated dry toner particles (i.e., image-fixing is achieved by use of a special toner).
  • 3,620,726 discloses the use of pigment developer of particle size within the range 0.2-30 ⁇ . ⁇ m, preferably within the range of 5.0-10.0 microns, with not more than 50% of the particles being of less than 1 ⁇ . ⁇ m equivalent spherical diameter, thereby reducing background stain.
  • the present invention provides a stable electroradiographic, magnetographic, or electrophotographic image of superior optical density, clarity, and resolution, by overcoming transfer and fixing problems often present in the prior art, as noted above.
  • the practice of the present invention is not limited to toner of particular thermoplastic or rheological properties, but depends upon encapsulation of particles in a receptor layer of critical rheological properties.
  • the present invention provides for the development, transfer, encapsulation, and fixing of dried liquid toner images in electrography. More particularly, stable, abrasion-resistant, continuous tone, high maximum transmission optical density electroradiographic image-bearing articles are provided.
  • an electrostatic charge pattern representative of an electrophotographic or of a radiographic image is established on a suitable electrostatic charge retaining medium.
  • the charge retaining layer may be a photo- or radioconductor, an insulating overlayer on the photo- or radioconductor, or an insulating layer onto which a charge image is transferred or directly sprayed.
  • the liquid toner developed image is formed by development of an electrostatic charge pattern with a finely divided solid charged or polarizable pigment material which is dispersed in a suitable high resistivity organic liquid (e.g., a mixture of medium molecular weight aliphatic hydrocarbons, )sopar@G, Exxon Corp.).
  • a suitable high resistivity organic liquid e.g., a mixture of medium molecular weight aliphatic hydrocarbons, )sopar@G, Exxon Corp.
  • liquid dispersant portion of the liquid toner image is then removed (e.g., by evaporation) leaving a dried toner image representative of the electrostatic charge image.
  • a suitable liquid e.g., water or hydrocarbons.
  • Pressure is then utilized to transfer the dried liquid toner image to a preferably transparent substrate bearing a transparent receptor coating which has a Newtonian complex dynamic melt viscosity (i.e., the dynamic melt viscosity is shear rate independent) of less than about 1.7 ⁇ 0.2x10 2 Pas (1.7 ⁇ 0.2x10 3 poise) and a loss tangent greater than 10 at the temperature of transfer.
  • the toner image is encapsulated in depth into the receptor coating.
  • the encapsulated toner image is then fixed into place within the receptor coating by returning it to room temperature and/or by application of curing radiation.
  • Stable, abrasion-resistant images having continuous tone and capable of maximum transmission optical densities in the range of 1.2 to 4.0 are produced.
  • encapsulation as used herein it is meant that at least 75%, and preferably at least 90%, of the particles transferred do not protrude out of the surface of the polymeric receptor coating.
  • liquid electrographic developers are known in the art.
  • the pigment particles therein are sub-micron in spherical diameter.
  • Much of the prior art utilizes dry powder toners wherein particle diameter is typically at least 5 to 20 microns.
  • dry toners are easier to handle and overcome problems such as inconsistency of results due to solvent evaporation, lateral image displacement, necessity for removal of vapors, etc., generally present when liquid toners are used, the liquid developers allow higher photographic sensitivity, dynamic range, and resolution.
  • Electrography has been adapted to include the recording of medical radiographs. (See Schaffert, Electrophotography, 2nd Ed., New York, Wiley (1975) pp. 191 ff, and assignee's copending patent application U.S.S.N. 963,897, filed on 27 November 1978, in the names of O. L. Nelson and V. Mikelsons).
  • Use of a liquid developer is crucial to obtaining the requisite resolution and sensitivity in the imaged article.
  • the electroradiograph In order for the electroradiograph to be acceptable for diagnostic purposes, it must exhibit a continuous tone transmission optical density range of at least 0 to 2.0, preferably 0 to 3.0, thereby providing contrast in the resulting image.
  • the developed toner image of such an electroradiograph must undergo linear transfer in order to preserve the optical density range and sensitivity of the original image. Linear transfer occurs when the percent of toner transferred is independent of the initial developed optical density.
  • Liquid toner images upon transfer with dispersant still. present, require a porous substrate or they are subject to lateral displacement.
  • the present invention provides for removal of up to 100% of the liquid dispersant portion of the liquid toner image before transfer of the image.
  • Toner deposits whether dry or liquid, have been described [M. R. V. Sahyun J. Photogr. Sci., 26, 177 (1978); T. W. King, O. L. Nelson and M. R. V. Sahyun, Photogr. Sci. Eng., 24, 93 (1980)j as representing a series of at least partially ordered, superposed layers of particles. Each layer contributes approximately 0.4 to the observed transmission optical density or approximately 0.8 to the observed reflection density.
  • the electrographic applications of the prior art, document copying, photographic printing, and proofing, etc. which typically yield maximum reflection densities of approximately 1.5, require not more than two layers of toner particles to form the image.
  • the radiographic application as described above, would correspondingly require an eight-layered deposit.
  • the high density, transmissively viewed deposit cannot be fixed to the surface of the transparent substrate unless some self-adhesive or thermoplastic character is imparted to the toner particles themselves. This requirement limits the toner materials choices to the potential detriment of both sensitivity and image quality.
  • the present invention provides a process whereby the charge pattern comprising a latent image typical of an electrograph, e.g., an electroradiograph (but not limited thereto), can be developed with a liquid developer dispersion, and the resulting dried liquid toner deposit transferred to a separate coated, transparent substrate, then encapsulated and fixed thereon, preferably by irradiation, to provide a stable, abrasion-resistant image.
  • This procedure may provide linear transfer of dried toner images having transmission optical densities in the range of 0 to 4.0.
  • Articles having transmission optical density ranges 0 to 4.0, 0 to 3.0, 0 to 2.0, and 0 to 1.5 are useful depending on the technical area in which the reproduction is to be used.
  • This invention also provides an article capable of high resolution, e.g., about 200 lp/mm. (lp means line pairs).
  • the receptor 10 comprises a transparent support 14, e.g., a polymeric material such as polyester, polymethylmethacrylate, cellulose triacetate, polyethylene, polystyrene film, or glass, bearing on one side a toner encapsulating coating 12, which preferably is about 3 to 100 pm thick, and most preferably is 10 to 50 ⁇ m thick.
  • a transparent support e.g., a polymeric material such as polyester, polymethylmethacrylate, cellulose triacetate, polyethylene, polystyrene film, or glass
  • a toner encapsulating coating 12 preferably is about 3 to 100 pm thick, and most preferably is 10 to 50 ⁇ m thick.
  • Non-transparent supports such as paper or aluminum may also be used.
  • One or more primer layers to promote adhesion of the coating 12 to the support 14 (and thereby help prevent transfer of the coated material to the photoreceptor surface), may optionally be included. Typical primer layers have been described in U.S. Patent No.
  • Fig. 2 shows encapsulation of the dried liquid toner image deposit in the receptor coating upon transfer.
  • the toner image particles are fixed into place either by cooling, if receptor layer 12 is a heated thermoplastic, or by curing, e.g., using ultraviolet radiation, if receptor layer 12 is a photopolymer, to form, as is shown in Fig. 3, a stable image-bearing layer 22 which in combination with transparent support 14 provides a stable, abrasion-resistant, image-bearing article 20 capable of providing a maximum transmission optical density of at least 3.0 for radiographic applications.
  • Images prepared according to this invention usually appear glossy, particularly as compared to images of prior art systems which appear flat or dull.
  • transferred images produced by the encapsulation and fixing of the present invention may be distinguished from adhesively transferred images of the prior art by other experimental means.
  • Scanning electron microscopy (SEM) with magnifications of from 1000x to 30,000x, has proved especially useful in defining the limiting cases of the transfer mechanism. It can be shown that with pure encapsulation transfer, the individual toner particles of substantially submicrometer size retain their integrity and are not subjected to gross deformation. This technique provides a clear cut distinction between encapsulation transfer and adhesion transfer.
  • SEM allows, determination of the distribution of the toner material in depth in the receptor coating as well as its morphology.
  • toner particles may be found as a homogeneous continuum of particles extending as deep as 3 to 4 pm for toner of the same particle diameter, i.e., approximately eight particle-diameters. Essentially no toner particles protrude through the surface of the coating as evidenced by scanning electronmicrographs. SEM evaluation of samples also showed that for receptor coating thicknesses greater than approximately 10 ⁇ m, the encapsulation transfer of deposits of the 0.4 pm mean diameter toner was independent of coating thickness.
  • the encapsulation mechanism of transfer has a direct bearing on the abrasion-resistance of the final, fixed image. This characteristic is measured with a standard AATCC Crockmeter (manufactured by Atlas Electric Devices Co.), typically in a 10 cycle test. A more positive response means more material removed, hence undesirably lower resistance to abrasion.
  • a more positive response means more material removed, hence undesirably lower resistance to abrasion.
  • the Crockmeter responses of images transferred by adhesion and encapsulation were evaluated. Independent of the specific material used in the receptor coating, Crockmeter response for adhesion transferred samples increased monotonically with optical density.
  • Transfer by adhesion depends on the surface characteristics of the receptor coatings, and specific receptor-toner interactions; it usually requires a "tacky" material.
  • encapsulation depends on bulk mechanical properties of the material comprising the receptor coating, and according to the present invention this material should be a viscoelastic liquid under the conditions of transfer.
  • Ferry Viscoelastic Properties of Polymers, 2nd Ed., New York, Wiley (1970) p. 18]
  • such materials may yet possess sufficiently high viscosities so as to appear to be solids or semi-solids, but may be recognized rheologically by a high value of the loss tangent, i.e., tan 6 is much greater than 1 (Ferry, pp. 49 and following).
  • Newtonian behavior means that the melt viscosity of the material is shear rate independent. Observations over the stress frequency range of 3 to 30 rad sec -1 confirm that those materials which allow encapsulation are Newtonian, whereas the adhesive transfer materials are not, as shown in Table I.
  • Receptor coatings coming within the scope of this invention have a Newtonian complex dynamic melt viscosity of less than about 1.7 ⁇ 0.2x10 3 poise and a loss tangent greater than 10, measured as described above, at the temperature of transfer.
  • the transfer rate is critical to obtaining encapsulation, and it is related to the shear rate at which the rheological properties are evaluated. Characteristic molecular relaxation times put an upper limit on the shear rates at which Newtonian behavior is observed in polymer systems. [Middleman, The Flow of High Polymers, New York, Wiley (1968) pp. 147-149]. Thus the receptor material choice puts an upper limit on the rate at which the transfer process may be effected.
  • This limitation may be overcome, however, by effecting lamination of the toner image-bearing donor to the receptor more rapidly, but subsequently maintaining these two elements in their intimate relationship at a temperature above T trans for a sufficient period of time (e.g., 0.5-30 sec) to allow the necessary molecular relaxations to take place.
  • the temperature of transfer is defined as a temperature below 180°C. It is preferred that the transfer process occurs at temperatures up to 130°C (above which temperature typical support materials, e.g., polyester films, tend to soften and deform); it is most preferred that the range of 20-70°C be used, both to conserve energy and to limit the extremes of temperature to which the photoreceptor, on which the image is originally developed, is subjected. Amorphous selenium, a photoconductor of choice for many applications, crystallizes when heated above 65°C, thereby forfeiting its photoconductive properties.
  • encapsulating coating materials exhibit the requisite viscoelastic properties (i.e., Newtonian complex dynamic melt viscosity of less than about 1.7 ⁇ 0.2x10 3 poise and a loss tangent of greater than 10) at the desirable lower temperature (i.e., 20-70°C range) and be stable and hard enough at room .temperature to provide adequate protection to the image from abrasion, e.g., scratching, fingerprinting, denting, etc.
  • a preferred embodiment of the encapsulating coating 12 (see Fig. 1) of the present invention is a radiation curable photopolymer.
  • the fluid properties can be suppressed by formation of a highly crosslinked structure in the coating after transfer through the application of radiant energy.
  • the crosslinking reaction of which can be initiated by irradiation in the presence of a suitable initiator.
  • the receptor coating In order to obtain uniform curing it is most preferable that the receptor coating not exceed 50 ⁇ m in thickness.
  • Suitable radiation curable encapsulating coatings can be formed from the materials in Table II, by combining the cross-linkable materials I to IV with initiators VI and VII.
  • Compound VI and related structures are especially useful to initiate crosslinking via cation active functionalities, e.g., epoxy groups as in Compound II, when sensitized as described in the Examples below and in the just mentioned patent, while compound VII is primarily a free radical progenitor, useful with ethylenically unsaturated prepolymers, such as compounds III, IV, and V.
  • Other useful initiators have been described in U.S. Patent Nos. 3,987,037 and 3,445,234.
  • the cross-linkable compositions in this table are not meant to be inclusive.
  • Other radiation curable materials having viscoelastic properties mentioned above are clearly within the scope of this invention.
  • Typical forms of curing radiation are ultraviolet, visible light, and electron beam. Of these, ultraviolet radiation is preferred.
  • This fixing process requires typically 10-1000 mJ cm- 2 , and is very energy efficient compared to thermal fixing of thermoplastic toners.
  • the hardness of image-bearing layer 22 of Fig. 3 can be determined by the Dornberg hardness test which measures the force which must be applied to a standard sapphire stylus to cause its complete penetration of the image-bearing layer.
  • the results, graphed in Fig. 7 as relative hardness (DHN) measured as just described versus time of ultraviolet irradiation, for compositions based on prepolymers of Compounds I-V of Table II, can be compared to a target value of 200 for hardness, estimated to be equivalent to that exhibited by a conventional, aldehyde hardened gelatin-silver halide emulsion coating on polyester base. It can be seen that less than 3 minutes of exposure to ultraviolet radiation resulted in full radiation curing for all compounds graphed. A blend of compounds I and V (I+V) needed only 30 seconds to 1 minute of ultraviolet radiation for full curing.
  • the material comprising the soft or softened receptor coating has a Newtonian complex dynamic melt viscosity of less than about 1.7 ⁇ 0.2x 10 3 poise and a loss tangent greater than 10 at the temperature of transfer.
  • a slurry of lead oxide pigment, styrene-butadiene resin binder (Goodyear Pliolite R S-7), and toluene was prepared with a 10:1 pigment-to-binder ratio.
  • the slurry was coated onto a 25 pm thick polyester foil. When dry, the coating was approximately 50 p m thick.
  • the dried coating was then overcoated with a slurry of carbon black and polyvinyl butyral resin in methanol to provide an electrically conductive contact. The ratio of carbon black to the resin was 1:1 by weight. With the polyester surface exposed, this layered structure was then mounted onto an aluminum plate so that the carbon coating made contact therewith.
  • polyester foil was then laminated to this exposed polyester surface, with a thin layer of dielectric fluid (mixture of medium molecular weight aliphatic hydrocarbons, Isopar R G, Exxon Corp.) in between to insure electrical uniformity.
  • dielectric fluid mixture of medium molecular weight aliphatic hydrocarbons, Isopar R G, Exxon Corp.
  • the new polyester surface was then wetted with isopropanol and contacted with the aluminum surface of a conformable electrode consisting of aluminum vapor coated 25 pm thick polyester. Uniform contact was assured by drawing a squeegee across the back of the conformable contact electrode to provide a thin, uniform interface film of isopropanol.
  • a voltage of 1 kV was applied across the device such that the top conformable electrode was at the negative polarity.
  • the device was subjected to imaging radiation.
  • an 80 kVp source, 1 sec, 25 ma exposure with a 100 cm source-to-device distance was used.
  • the applied voltage was reduced to zero, and the conformable top electrode was removed by peeling at a rate of approximately 25 cm sec- 1.
  • the polyester foil bearing the image was removed from the rest of the device.
  • the unfixed image exhibited a net developed transmission optical density of 4.2.
  • a receptor layer was prepared by coating polystyrene (average MW 2000, dispersity 1.13) plasticized with 10 wt% paraffin wax, at 20% solids from toluene onto a 100 ⁇ m primed polyester substrate. The 15 micron thick coating was dried by brief heating above 65°C. The coating was then drawn face-to-face with the image bearing substrate at a speed of approximately a.25 cm sec -1 between laminator rolls, one of which comprised a silicone rubber surface heated to 130°C, while the other possessed a polished metal surface. After cooling to room temperature, the polyester supports were separated to yield the toner image entirely encapsulated in the hard, glossy polystyrene coating. The encapsulated image exhibited a net transmission optical density of 3.7.
  • An electrophotographic latent image was simulated by contact charging various regions of the surface of a 25 ⁇ m thick polyester insulating foil to various negative surface potentials.
  • the polyester foil was brought into intimate contact with a grounded aluminum base plate with a thin layer of isopropanol in between to insure electrical uniformity.
  • a conformable electrode was then laminated to the desired region of the polyester surface as described in Example 1 and brought to a potential of about -60V.
  • the electrode was mechanically removed and the isopropanol allowed to evaporate under ambient conditions to leave a charge pattern on the surface. This charge pattern was then developed with the liquid toner LTD.
  • the toner image was allowed to dry, and the polyester foil removed from the aluminum base plate.
  • the toner deposit exhibited a maximum transmission optical density of 3.0.
  • a receptor was prepared by coating: where solution A comprised the polystyrene of Example 1 (22.75 wt%) and paraffin wax (2.25 wt%) in toluene, and solution B comprised a copolymer of styrene (55%), isooctyl acrylate (37%), and acrylic acid (8%) at a concentration of 25 wt% in a 30/70 isopropanol/toluene mixture, on a biaxially oriented, heat-set coextruded support film.
  • the resulting article was as described in U.S. Patent No. 4,011,358, and the support film correspond to Example 7 therein.
  • the dried, image receiving layer was approximately 3 ⁇ m thick.
  • a 5 cm strip of the polyester foil bearing the toner deposit was laminated face-to-face with the above receptor, using a hard rubber roller, on the surface of a Kofler Thompsonbank@ device, a polished, heated, metal block wherein its calibrated surface temperature varies linearly along its length. Encapsulation of the toner deposit in the receptor layer to yield a net transmission optical density of 2.6 and a glossy surface, occurred at Walkerbank device surface temperatures from 80°C to 130°C, the limit to the dimensional stability of the receptor substrate.
  • a receptor coating composition was prepared from the following:
  • the mixture was knife coated in the dark on 175 um thick polyester photographic film base, which was primed and bore a gelatin subbing layer, to yield a 30 pm thick photocurable receptor after drying.
  • a photoconductor-insulator construction comprising a 25 micron thick polyester foil, a 50 p m thick layer of photoconductive cadmium sulfide dispersed in a styrene-butadiene copolymer with a pigment-to-binder ratio of 10:1, and a conducting layer comprising a dispersion of carbon black in polyvinyl butyral was assembled and mounted on an aluminum base plate as described in Example 1.
  • the device was elaborated by laminating a second 25 pm thick polyester foil to the insulating surface thereof with a thin layer of dielectric fluid (lsopar@ G, Exxon Corp.) between the layers.
  • Example 2 The entire construction was dark adapted and contact charged to -1 kV, as in Example 1, using a transparent, conformable electrode comprising a thin conductive layer of indium oxide on a polyester dielectric film (Teijin TM@ film, Teijin, Ltd.), laminated to the polyester surface with isopropanol.
  • a transparent, conformable electrode comprising a thin conductive layer of indium oxide on a polyester dielectric film (Teijin TM@ film, Teijin, Ltd.), laminated to the polyester surface with isopropanol.
  • the device was imaged through the transparent electrode to a pattern projected by an Omega B22 photographic enlarger (incandescent source), with 10x magnification. A one second exposure atf/8 was used, corresponding to approximately 1.6 m-can-sec illuminance at maximum. After exposure, the conformable electrode was removed and the isopropanol allowed to evaporate in the dark. The entire construction was then flooded with light and, with application of a -525 volt bias potential, developed under room light with the liquid toner LTD.
  • the image was allowed to dry under ambient conditions, and the image-bearing foil was then removed from the permanent photoconductor-insulator construction. This foil was then laminated with the photocurable receptor on a hot plate surface at 50°C. After cooling to room temperature, the combination was irradiated through the donor substrate for 30 seconds with a 30 watt ultraviolet fluorescent source. The donor substrate was then easily removable leaving a hard, clear receptor coating with the toner image encapsulated therein. Attempted transfer of a similarly formed image at room temperature yielded primarily adhesive transfer so that the image was not fixed, even after radiation curing.
  • a vapor-deposited, amorphous selenium plate was charged and imaged by X-ray exposure, as described by Schaffert et al. in U.S. Patent No. 2,666,144.
  • the image was developed using liquid toner LTD.
  • the dispersant was allowed to evaporate to leave a dried, matte-appearing toner deposit on the selenium surface.
  • a receptor was coated as described in Example 2.
  • the coating composition comprised:
  • a piece of this dried coating was preheated to 55-60°C on the surface of a hot plate under subdued light, then laminated immediately to the image-bearing selenium plate by application of approximately 1 kg/cm 2 with a rubber roller.
  • the laminate was then cured by ultraviolet irradiation as described in Example 3 through the receptor substrate. After irradiation, the receptor was easily removed from the selenium surface and left no residue thereupon.
  • the receptor coating was hard and glossy, and the toner image was shown by SEM to be encapsulated therein.
  • a toner image of maximum transmission optical density 4.0 was formed on a 25 pm thick polyester intermediate layer selectively charged and developed according to the method of Example 2. After development, the dispersant was allowed to evaporate until the toner deposit acquired a matte appearance.
  • a receptor comprising carnauba wax, 6 ⁇ m thick on a 100 ⁇ m thick primed polyester support, was prepared by coating a solution of the wax, 4 wt% in xylene at 55°C, on the polyester foil using a No. 34 Meyer Bar. The coating, after air drying, was heated briefly at 80°C to complete drying and clarify the initially hazy coating. The coating was laminated face-to-face with the polyester substrate bearing the toner image using a hard rubber roller with the receptor on a polished metal block heated to approximately 125°C.
  • the substrates were separated.
  • the toner image was completely transferred to the wax coating, wherein it exhibited a maximum transmission optical density of 3.4.
  • a linear relationship of the optical densities of the transferred image to those of the original image resulted.
  • the surface of the transferred image was very hard and abrasion resistant. Characterization by SEM indicated that the toner deposit was encapsulated and localized in a domain comprising the uppermost 2 microns of the coating. No particulate matter was visible on the coating surface after transfer in the SEM.
  • styrene-butadiene copolymer Goodyear Pliolite®
  • the image-bearing substrate and a sample of the radiation curable coating construction were laminated face-to-face at 60°C. While together, they were placed in a graphic arts vacuum frame and irradiated 2 minutes by a 400 watt mercury arc lamp located 30 cm from the receptor side. After irradiation, the donor foil separated easily to leave a smooth, hard coating on the receptor with the toner image incorporated therein.
  • the transferred, cured image exhibited a maximum transmission optical density of 1.7.
  • a receptor coating was prepared from a solution comprising a mixture of 0.39 g high molecular weight polymethyl methacrylate (Elvacite@ 2041, du Pont Corp.), 1.60 g ECHM, 0.016 g ethyl dimethoxyanthracene, and 0.06 g DIH, wherein the mixture represents about 40% solids in acetone solution.
  • the wet coating was approximately 100 ⁇ m thick on blue tinted polyester sheets and dried at room temperature. Images were transferred as in Example 6. Again, the encapsulating layer was cured by radiation as in Example 3. More than 95% of the toner image particles transferred and were encapsulated in the receptor coating.
  • Example 1 To the lead oxide radiographic construction of Example 1 was laminated, as described therein, a 25 ⁇ m thick polyester foil. The combination was charged in the same manner to -1 kV, exposed to a 30 mR dosage of 42 kVp X-rays through a lead foil resolving power test target, and the conformable electrode removed. The resulting charge pattern was developed with LTD. After the toner deposit had dried sufficiently to present a matte appearance, the polyester foil bearing the image was removed from the construction. The image resolution was determined to be 9 lp/mm, and its maximum transmission optical density was 1.9.
  • a receptor coating was prepared by coating the following composition: on 175 pm thick blue tinted polyester film. After thorough drying, the coating was laminated with the image-bearing foil in the apparatus of Example 1 with the heated roller at 85°C. The laminated combination was then irradiated through the receptor substrate for 2 minutes in a graphic arts vacuum frame (400 watt mercury source, 30 cm lamp-to-frame distance). Thereafter the donor foil was easily stripped away to leave a hard receptor coating with the toner image encapsulated therein. This image continued to exhibit 9 lp/mm resolution. The maximum net developed transmission optical density was reduced to 1.1, although no material remained on the donor foil.
  • a receptor was prepared from a solution comprising 2 g of Epon@ 1001 (Table I, footnote c) in 8 g of 1,1,2-trichloroethane.
  • the wet coating was approximately 100 microns thick on blue tinted polyester film and dried to approximately 14 pm thick.
  • Simulated images were prepared as described in Example 2.
  • the receptor coating was then drawn face-to-face with the image bearing substrate at a speed of 0.25 cm sec-1 between laminator rolls heated to 130°C as in Example 1. It was found by substituting fine particles of materials of calibrated melting points (Tempilstiks®, Big Three Industries, Inc.) for the toner that the temperature of the donor-receptor interface was thus 73 ⁇ 5°C. Three runs were performed.
  • the image bearing substrate developed with liquid toner was placed in contact with the coating immediately after development (wet); in the second after the surface was substantially free of dispersant but before a matte appearance was achieved (partially dry); and in the third, after drying to an effectively dispersant free condition which left a matte appearing toner deposit (dry).
  • dry the toner image was successfully transferred to the receptor coating yielding net optical densities as indicated in Table III.
  • a second receptor was prepared from a hot melt of carnauba wax on 175 ⁇ m thick, blue tinted polyester film to a coating thickness of ca 3 ⁇ m.
  • the image bearing substrate was developed and allowed to dry to varying degrees of dryness as described above. Transfer was accomplished as in Example 1. Encapsulation occurred only with effectively dispersant free toner images to yield a net transferred optical density of approximately 1.8.
  • a magnetic pattern consisting of an area of 3M Plastiform@ magnetic material, comprising, in turn, an array of magnetic poles, spaced 6.7 per cm, in a flexible polymeric medium, was laminated a 25 ⁇ m thick polyethylene film.
  • a liquid developer was prepared by dilution of Lignosite@ ferro fluid (Crown Zellerbach, Inc.), comprising 80 A magnetite particles dispersed in water with the aid of a lignin sulfonic acid surfactant, to about 1% solids, and addition of a few drops of a non-ionic wetting agent (Eastman Kodak Photo-Flo@ 200).
  • the magnetic pattern was developed on the polyethylene surface, by application of the developer thereto; the excess was removed in an air-stream and the water was evaporated by application of heat.
  • the image-bearing polyethylene support was then removed from the magnet array.
  • Example 6 A sample of the receptor coating of Example 6 was preheated to 70°C and laminated to the polyethylene film bearing the magnetic image. The combination was cured 2 min by irradiation in a vacuum frame as described in that Example. The polyethylene support was then stripped away to leave the magnetite particles encapsulated in image-wise fashion in the hard receptor coating.
  • a micro-image was formed on a sample of organic photoconductive material (SO-102, Eastman Kodak Co.) by projecting a 24x reduced image of a resolving power test target. It was developed with a liquid toner comprising a dispersion of sub-micrometer, non-thermoplastic pigment particles dispersed in a mixture of medium molecular weight aliphatic hydrocarbons. The dispersant was allowed to evaporate. The dried image was laminated to a 10 ⁇ m thick coating of the SIA resin of Table I, footnote (d) , on 175 ⁇ m thick polyester photographic film base in the apparatus of Example 1. The surface temperature of the heated roller was 115°C; a pressure of 5 kg/cm 2 was applied; and the transfer rate was 0.5 cm/sec. The receptor coating was removed from the photoconductive donor to reveal essentially complete transfer of the image, which was encapsulated and exhibited 150 lp/mm resolution.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Liquid Developers In Electrophotography (AREA)

Claims (10)

1. Procédé de transfert, d'encapsulation et de fixage d'images de toner liquide séchées en électrographie, comprenant les phases suivantes:
(a) la prévision d'un substrat portant une image développée par toner liquide sur au moins une surface, ce procédé étant caractérisé par:
(b) l'enlèvement d'une quantité allant jusqu'à 100% de l'agent dispersant liquide à partir de l'image de toner liquide susdite afin que la matière de toner soit convertie en une composition d'image de toner séchée, comprenant au moins 50% en poids de matières solides,
(c) l'amenée de l'image de toner séchée en contact avec un enrobage récepteur doux ou ramollissable sur un substrat, l'application d'une pression et éventuellement d'une chaleur pour que l'image de toner séchée subisse un transfert linéaire et une encapsulation sous forme d'une couche continue de particules, d'une épaisseur allant jusqu'à environ 8 diamètres de particule, à l'intérieur de l'enrobage récepteur mou ou ramolli résultant, au moins 75% des particules transférées ne faisant pas saillie à partir de la surface, la matière formant cet enrobage récepteur mou ou ramolli ayant une viscosité de masse fondue dynamique complexe newtonienne de moins d'environ 1,7±0,2x 102 Pa.s (1,7±0,2x 103 poise) et une tangente de perte supérieure à 10 à la température de transfert et
(d) le durcissement de l'enrobage récepteur.
2. Procédé suivant la revendication 1, caractérisé en ce que l'image de toner susdite est une image électroradiographique ou une microimage.
3. Procédé d'électrographie suivant l'une ou l'autre des revendications 1 et 2, caractérisé en outre en ce que l'image développée par toner liquide est formée par développement d'un dessin de charge électrostatique avec une matière pigmentaire polarisable ou chargée, opaque, solide, finement subdivisée, ou est formée par développement d'un dessin magnétique avec une matière pigmentaire magnétisable ou magnétique, opaque, finement subdivisée, cette matière pigmentaire étant dispersée dans un liquide organique approprié, de haute résistivité.
4. Procédé suivant l'une quelconque des revendications 1 à 3, caractérisé en outre en ce que le substrat portant l'image est un photorécepteur capable de porter un dessin de charge électrostatique.
5. Procédé suivant l'une quelconque des revendications 1 à 3, caractérisé en outre en ce que le substrat portant l'image est un substrat isolant sur lequel un dessin de charge a été transféré ou directement pulvérisé.
6. Procédé suivant l'une quelconque des revendications 1 à 5, caractérisé en outre en ce que l'enrobage récepteur est d'une épaisseur d'environ 3 à 100 p et en ce que la température de transfert est comprise entre 20 et 130°C.
7. Procédé suivant l'une quelconque des revendications 1 à 6, caractérisé en outre en ce que l'enrobage récepteur est durcissable par rayonnement.
8. Procédé suivant l'une quelconque des revendications 1 à 7, caractérisé en outre en ce que l'image encapsulée résultante montre des densités optiques par transmission et en ton continu, se situant dans l'intervalle de 0 à 4,0, et en ce qu'au moins certaines particules de toner s'étendent jusqu'à une profondeur de 3 p dans l'enrobage récepteur, l'image susdite développée par toner montrant une résolution allant jusqu'à environ 200 paires de lignes/mm.
9. Procédé suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que le substrat et l'enrobage récepteur mou ou ramollissable sont transparents du point de vue optique.
10. Article électrographique, résistant à l'abrasion, stable, comprenant un substrat portant un enrobage récepteur polymère, cet article étant caractérisé en ce que l'enrobage récepteur contient des particules encapsulées, d'une taille essentiellement inférieure au micron et réparties d'une manière propre à former une image dans une couche homogène d'une épaisseur allant jusqu'à environ huit diamètres de particule, et ayant une densité optique par transmission résultante de l'ordre de 0 à 4,0, ces particules étant encapsulées dans l'enrobage de manière qu'au moins 75% d'entre elles ne fassent pas saillie à la surface de cet enrobage, celui-ci ayant une viscosité de masse fondue dynamique complexe newtonienne de moins d'environ 1,7±0,2x102 Pa.s et une tangente de perte supérieure à 10 à la température à laquelle les. particules de toner sont noyées.
EP81303438A 1980-08-11 1981-07-27 Transfert, blindage et fixage des dessins de poudre Expired EP0046026B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/177,259 US4337303A (en) 1980-08-11 1980-08-11 Transfer, encapsulating, and fixing of toner images
US177259 1980-08-11

Publications (3)

Publication Number Publication Date
EP0046026A2 EP0046026A2 (fr) 1982-02-17
EP0046026A3 EP0046026A3 (en) 1983-02-23
EP0046026B1 true EP0046026B1 (fr) 1985-10-23

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EP81303438A Expired EP0046026B1 (fr) 1980-08-11 1981-07-27 Transfert, blindage et fixage des dessins de poudre

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US (1) US4337303A (fr)
EP (1) EP0046026B1 (fr)
JP (1) JPS5763528A (fr)
AU (1) AU546880B2 (fr)
BR (1) BR8105131A (fr)
CA (1) CA1163491A (fr)
DE (1) DE3172718D1 (fr)

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Also Published As

Publication number Publication date
JPH0532746B2 (fr) 1993-05-17
AU546880B2 (en) 1985-09-26
BR8105131A (pt) 1982-04-27
DE3172718D1 (en) 1985-11-28
AU7393381A (en) 1982-02-18
US4337303A (en) 1982-06-29
CA1163491A (fr) 1984-03-13
EP0046026A3 (en) 1983-02-23
EP0046026A2 (fr) 1982-02-17
JPS5763528A (en) 1982-04-17

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